FanboiFresh Posted April 29, 2018 Share Posted April 29, 2018 Hey. So just got my accessport a couple weeks ago and noticed I’m not hitting peak boost. I’m currently on stage 1 93 and it’s only reaching 10.9psi, I’ve seen it once hot 12.8psi. So seem to have a boost leak of some kind. Car is 100% factory currently with just the AP. Any ideas on where these cars like to leak boost? It has 120k miles. Link to comment Share on other sites More sharing options...
relative4 Posted April 29, 2018 Share Posted April 29, 2018 There are a lot of reasons for not hitting target boost, but a smoke test / boost leak test is a good place to start on general principles. While you're getting that together, can you post learned values or at least A/F learning in the A-D ranges? Link to comment Share on other sites More sharing options...
ehsnils Posted April 29, 2018 Share Posted April 29, 2018 What does the knock sensor say? That is an important factor - if the boost is pulled due to the knock sensor detecting noise then you should check for rattling stuff and other items. If no considerable knock, then it's likely a leak somewhere, like leaking hoses. Even the wastegate in the turbo may be the cause, since it may not close properly. Link to comment Share on other sites More sharing options...
FanboiFresh Posted April 29, 2018 Author Share Posted April 29, 2018 So I had knock learning up and there was no knocking. And as do the af learning I will set those and take a drive after work. Going to be ordering a boost leak tester after work as well. Any recommendations on which one to get? Link to comment Share on other sites More sharing options...
FanboiFresh Posted April 30, 2018 Author Share Posted April 30, 2018 No a/f learning. Fine knock sensed -1.4 (uppipe Heat shield is dangling i found out) also using Fred Meyer gas, wife filled up and didn’t know the oct content was 92. Just swapped in fresh o2 sensor and new unequal length headers. Still only hitting 11.9psi ish.. Next I suppose is search for a boost leak somewhere. Anything else I should read into on my AP? Or anything else I should check? Link to comment Share on other sites More sharing options...
robburns201 Posted April 30, 2018 Share Posted April 30, 2018 Pull up A/F a,b,c,d and take a drive/do pull and post numbers that should tell us if you have a leak...I believe all should be within +/- 7%... Link to comment Share on other sites More sharing options...
FanboiFresh Posted April 30, 2018 Author Share Posted April 30, 2018 Ok I’ll do that tonight! Thanks robburns101 Link to comment Share on other sites More sharing options...
FanboiFresh Posted May 2, 2018 Author Share Posted May 2, 2018 http://i1079.photobucket.com/albums/w506/Fanboifresh/9FA880F0-1984-4420-A368-B4D59995EB13_zpsfnxzg0zn.jpeg' alt='9FA880F0-1984-4420-A368-B4D59995EB13_zpsfnxzg0zn.jpeg'> Link to comment Share on other sites More sharing options...
FanboiFresh Posted May 2, 2018 Author Share Posted May 2, 2018 That is what it learned after replacing o2 today with oem one. How’s that looking to you guys? Link to comment Share on other sites More sharing options...
FanboiFresh Posted May 2, 2018 Author Share Posted May 2, 2018 Note. At one point the AF correction 1 reached 20. Forgot to take photo of it before I switched to troubleshoot to check emissions readiness Link to comment Share on other sites More sharing options...
relative4 Posted May 2, 2018 Share Posted May 2, 2018 Photobucket is no bueno. You can upload pics to the forum. Link to comment Share on other sites More sharing options...
FanboiFresh Posted May 3, 2018 Author Share Posted May 3, 2018 Well shit, it’s not letting me upload it onto the forum.. I’ll just type them out AF learning A 6.5% (1.9% / 6.5%) AF learning B 1.4% AF learning C 1.6% AF learning D 3.3% Af correction 1 3.3% (-17.9% / 15.62%) Af correction 3 -3.1% (-2.66% / 2.58%) Link to comment Share on other sites More sharing options...
relative4 Posted May 3, 2018 Share Posted May 3, 2018 Fuel trims look great. A learning view would give a lot of info about any knock issues. Can you log a pull including boost and TD boost error? Link to comment Share on other sites More sharing options...
solidxsnake Posted May 3, 2018 Share Posted May 3, 2018 Don't worry about AF correction after the fact, it's only useful to look at while you're driving, and even then, unless it's pegged at +/- 25%, it's very likely okay. Fuel trims look okay, but the relatively high positive A value could indicate a minor vacuum leak. Check for leaks. Follow the "Leak test" instructions in this post: http://legacygt.com/forums/showpost.php?p=4491795&postcount=1 Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.